id:A055462 - OEIS Search Results

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Superduperfactorials: product of first n superfactorials.

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1, 1, 2, 24, 6912, 238878720, 5944066965504000, 745453331864786829312000000, 3769447945987085350501386572267520000000000 (list; graph; listen)

	OFFSET	`0,3`
	FORMULA	`a(n) = a(n-1)*A000178(n) = Product[(i!)^(n-i+1)] over 1 <= i <= n = Product[i^((n-i+1)(n-i+2)/2)] over 1 <= i <= n`
	EXAMPLE	`a(4) = 1!2!3!4!1!2!3!1!2!1! = 2881221 = 6912`
	CROSSREFS	`Cf. A000142, A000178, A002109.` `Adjacent sequences: A055459 A055460 A055461 this_sequence A055463 A055464 A055465` `Sequence in context: A059332 A000794 A088912 this_sequence A088600 A066120 A062716`
	KEYWORD	`easy,nonn`
	AUTHOR	`Henry Bottomley (se16(AT)btinternet.com), Jun 26 2000`

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Last modified May 16 01:24 EDT 2008. Contains 139630 sequences.